When Astroquarium enters the battlefield, you may put an art sticker on it.
![%1](graph/manas_txt/1.png)
,
![%T](graph/manas_txt/T.png)
: Until end of turn, target creature becomes a blue Shark with base power and toughness 4/4. If the cracks in Astroquarium's art are completely covered, that creature becomes a blue Octopus with base power and toughness 8/8 instead. Activate only as a sorcery.